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SQLAlchemy: Creating vs. Reusing a Session
...g sessionmaker() once but calling the resulting Session() class each time you need to talk to your DB. For me that means the second I would do my first session.add(x) or something similar, I would first do
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When to use dynamic vs. static libraries
...ded when first called -- and can be shared among components that use the same library (multiple data loads, one code load).
Dynamic libraries were considered to be the better approach most of the time, but originally they had a major flaw (google DLL hell), which has all but been eliminated by more...
PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
...to do with the navigation. I've used mod_rewrite , as per CodeIgniter documentation.
9 Answers
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Why use argparse rather than optparse?
I noticed that the Python 2.7 documentation includes yet another command-line parsing module. In addition to getopt and optparse we now have argparse .
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What is the difference between Amazon SNS and Amazon SQS?
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SNS is a distributed publish-subscribe system. Messages are pushed to subscribers as and when they are sent by publishers to SNS.
SQS is distributed queuing system. Messages are NOT pushed to receivers. Receivers have to poll or pull messages from SQS. Messages can't be...
Why are unsigned int's not CLS compliant?
...which I suspect drove the decision of the designers of VB7/7.1 not to implement as well (it's implemented now in VB8).
To quote:
http://msdn.microsoft.com/en-us/library/12a7a7h3.aspx
The CLS was designed to be large enough to include the language
constructs that are commonly needed by developers, y...
How Pony (ORM) does its tricks?
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The most complex part is the second step, where Pony must
understand the "meaning" of Python expressions. Seems you are most
interested in the first step, so let me explain how decompiling works.
Let's consider this query:
>>> from pony.orm.examples.estore import *
>>> select(c ...
SignalR: Why choose Hub vs. Persistent Connection?
...aying the lower-level persistent connections.
From the highly up-voted comment below:
Partially correct. You can get topics or groups in persistent connections as well. The big difference is dispatching different types of messages. For example you have different kinds of messages and you want ...
What is the memory consumption of an object in Java?
Is the memory space consumed by one object with 100 attributes the same as that of 100 objects, with one attribute each?
12...
What is the difference between JAX-RS and JAX-WS?
...quest like JAX-WS?
1) I don't know if the JAX-RS API includes a specific mechanism for asynchronous requests, but this answer could still change based on the client implementation you use.
Can JAX-RS access a web service that is not running on the Java platform, and vice versa?
2) I can't t...